opcodes/m32r-asm.c

   1 /* Assembler interface for targets using CGEN. -*- C -*-
   2    CGEN: Cpu tools GENerator
   3
   4    THIS FILE IS MACHINE GENERATED WITH CGEN.
   5    - the resultant file is machine generated, cgen-asm.in isn't
   6
   7    Copyright (C) 1996-2015 Free Software Foundation, Inc.
   8
   9    This file is part of libopcodes.
  10
  11    This library is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3, or (at your option)
  14    any later version.
  15
  16    It is distributed in the hope that it will be useful, but WITHOUT
  17    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  18    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  19    License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software Foundation, Inc.,
  23    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  24
  25
  26 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  27    Keep that in mind.  */
  28
  29 #include "sysdep.h"
  30 #include <stdio.h>
  31 #include "ansidecl.h"
  32 #include "bfd.h"
  33 #include "symcat.h"
  34 #include "m32r-desc.h"
  35 #include "m32r-opc.h"
  36 #include "opintl.h"
  37 #include "xregex.h"
  38 #include "libiberty.h"
  39 #include "safe-ctype.h"
  40
  41 #undef  min
  42 #define min(a,b) ((a) < (b) ? (a) : (b))
  43 #undef  max
  44 #define max(a,b) ((a) > (b) ? (a) : (b))
  45
  46 static const char * parse_insn_normal
  47   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  48 \f
  49 /* -- assembler routines inserted here.  */
  50
  51 /* -- asm.c */
  52 static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");
  53
  54 /* Handle '#' prefixes (i.e. skip over them).  */
  55
  56 static const char *
  57 parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  58             const char **strp,
  59             int opindex ATTRIBUTE_UNUSED,
  60             long *valuep ATTRIBUTE_UNUSED)
  61 {
  62   if (**strp == '#')
  63     ++*strp;
  64   return NULL;
  65 }
  66
  67 /* Handle shigh(), high().  */
  68
  69 static const char *
  70 parse_hi16 (CGEN_CPU_DESC cd,
  71             const char **strp,
  72             int opindex,
  73             unsigned long *valuep)
  74 {
  75   const char *errmsg;
  76   enum cgen_parse_operand_result result_type;
  77   bfd_vma value;
  78
  79   if (**strp == '#')
  80     ++*strp;
  81
  82   if (strncasecmp (*strp, "high(", 5) == 0)
  83     {
  84       *strp += 5;
  85       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_ULO,
  86                                    & result_type, & value);
  87       if (**strp != ')')
  88         return MISSING_CLOSING_PARENTHESIS;
  89       ++*strp;
  90       if (errmsg == NULL
  91           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
  92         {
  93           value >>= 16;
  94           value &= 0xffff;
  95         }
  96       *valuep = value;
  97       return errmsg;
  98     }
  99   else if (strncasecmp (*strp, "shigh(", 6) == 0)
 100     {
 101       *strp += 6;
 102       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_SLO,
 103                                    & result_type, & value);
 104       if (**strp != ')')
 105         return MISSING_CLOSING_PARENTHESIS;
 106       ++*strp;
 107       if (errmsg == NULL
 108           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 109         {
 110           value += 0x8000;
 111           value >>= 16;
 112           value &= 0xffff;
 113         }
 114       *valuep = value;
 115       return errmsg;
 116     }
 117
 118   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 119 }
 120
 121 /* Handle low() in a signed context.  Also handle sda().
 122    The signedness of the value doesn't matter to low(), but this also
 123    handles the case where low() isn't present.  */
 124
 125 static const char *
 126 parse_slo16 (CGEN_CPU_DESC cd,
 127              const char ** strp,
 128              int opindex,
 129              long * valuep)
 130 {
 131   const char *errmsg;
 132   enum cgen_parse_operand_result result_type;
 133   bfd_vma value;
 134
 135   if (**strp == '#')
 136     ++*strp;
 137
 138   if (strncasecmp (*strp, "low(", 4) == 0)
 139     {
 140       *strp += 4;
 141       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 142                                    & result_type, & value);
 143       if (**strp != ')')
 144         return MISSING_CLOSING_PARENTHESIS;
 145       ++*strp;
 146       if (errmsg == NULL
 147           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 148         value = ((value & 0xffff) ^ 0x8000) - 0x8000;
 149       *valuep = value;
 150       return errmsg;
 151     }
 152
 153   if (strncasecmp (*strp, "sda(", 4) == 0)
 154     {
 155       *strp += 4;
 156       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_SDA16,
 157                                    NULL, & value);
 158       if (**strp != ')')
 159         return MISSING_CLOSING_PARENTHESIS;
 160       ++*strp;
 161       *valuep = value;
 162       return errmsg;
 163     }
 164
 165   return cgen_parse_signed_integer (cd, strp, opindex, valuep);
 166 }
 167
 168 /* Handle low() in an unsigned context.
 169    The signedness of the value doesn't matter to low(), but this also
 170    handles the case where low() isn't present.  */
 171
 172 static const char *
 173 parse_ulo16 (CGEN_CPU_DESC cd,
 174              const char **strp,
 175              int opindex,
 176              unsigned long *valuep)
 177 {
 178   const char *errmsg;
 179   enum cgen_parse_operand_result result_type;
 180   bfd_vma value;
 181
 182   if (**strp == '#')
 183     ++*strp;
 184
 185   if (strncasecmp (*strp, "low(", 4) == 0)
 186     {
 187       *strp += 4;
 188       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 189                                    & result_type, & value);
 190       if (**strp != ')')
 191         return MISSING_CLOSING_PARENTHESIS;
 192       ++*strp;
 193       if (errmsg == NULL
 194           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 195         value &= 0xffff;
 196       *valuep = value;
 197       return errmsg;
 198     }
 199
 200   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 201 }
 202
 203 /* -- */
 204
 205 const char * m32r_cgen_parse_operand
 206   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 207
 208 /* Main entry point for operand parsing.
 209
 210    This function is basically just a big switch statement.  Earlier versions
 211    used tables to look up the function to use, but
 212    - if the table contains both assembler and disassembler functions then
 213      the disassembler contains much of the assembler and vice-versa,
 214    - there's a lot of inlining possibilities as things grow,
 215    - using a switch statement avoids the function call overhead.
 216
 217    This function could be moved into `parse_insn_normal', but keeping it
 218    separate makes clear the interface between `parse_insn_normal' and each of
 219    the handlers.  */
 220
 221 const char *
 222 m32r_cgen_parse_operand (CGEN_CPU_DESC cd,
 223                            int opindex,
 224                            const char ** strp,
 225                            CGEN_FIELDS * fields)
 226 {
 227   const char * errmsg = NULL;
 228   /* Used by scalar operands that still need to be parsed.  */
 229   long junk ATTRIBUTE_UNUSED;
 230
 231   switch (opindex)
 232     {
 233     case M32R_OPERAND_ACC :
 234       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_acc);
 235       break;
 236     case M32R_OPERAND_ACCD :
 237       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accd);
 238       break;
 239     case M32R_OPERAND_ACCS :
 240       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accs);
 241       break;
 242     case M32R_OPERAND_DCR :
 243       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r1);
 244       break;
 245     case M32R_OPERAND_DISP16 :
 246       {
 247         bfd_vma value = 0;
 248         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP16, 0, NULL,  & value);
 249         fields->f_disp16 = value;
 250       }
 251       break;
 252     case M32R_OPERAND_DISP24 :
 253       {
 254         bfd_vma value = 0;
 255         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP24, 0, NULL,  & value);
 256         fields->f_disp24 = value;
 257       }
 258       break;
 259     case M32R_OPERAND_DISP8 :
 260       {
 261         bfd_vma value = 0;
 262         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP8, 0, NULL,  & value);
 263         fields->f_disp8 = value;
 264       }
 265       break;
 266     case M32R_OPERAND_DR :
 267       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 268       break;
 269     case M32R_OPERAND_HASH :
 270       errmsg = parse_hash (cd, strp, M32R_OPERAND_HASH, (long *) (& junk));
 271       break;
 272     case M32R_OPERAND_HI16 :
 273       errmsg = parse_hi16 (cd, strp, M32R_OPERAND_HI16, (unsigned long *) (& fields->f_hi16));
 274       break;
 275     case M32R_OPERAND_IMM1 :
 276       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_IMM1, (unsigned long *) (& fields->f_imm1));
 277       break;
 278     case M32R_OPERAND_SCR :
 279       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r2);
 280       break;
 281     case M32R_OPERAND_SIMM16 :
 282       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM16, (long *) (& fields->f_simm16));
 283       break;
 284     case M32R_OPERAND_SIMM8 :
 285       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM8, (long *) (& fields->f_simm8));
 286       break;
 287     case M32R_OPERAND_SLO16 :
 288       errmsg = parse_slo16 (cd, strp, M32R_OPERAND_SLO16, (long *) (& fields->f_simm16));
 289       break;
 290     case M32R_OPERAND_SR :
 291       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 292       break;
 293     case M32R_OPERAND_SRC1 :
 294       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 295       break;
 296     case M32R_OPERAND_SRC2 :
 297       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 298       break;
 299     case M32R_OPERAND_UIMM16 :
 300       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM16, (unsigned long *) (& fields->f_uimm16));
 301       break;
 302     case M32R_OPERAND_UIMM24 :
 303       {
 304         bfd_vma value = 0;
 305         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_UIMM24, 0, NULL,  & value);
 306         fields->f_uimm24 = value;
 307       }
 308       break;
 309     case M32R_OPERAND_UIMM3 :
 310       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM3, (unsigned long *) (& fields->f_uimm3));
 311       break;
 312     case M32R_OPERAND_UIMM4 :
 313       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM4, (unsigned long *) (& fields->f_uimm4));
 314       break;
 315     case M32R_OPERAND_UIMM5 :
 316       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM5, (unsigned long *) (& fields->f_uimm5));
 317       break;
 318     case M32R_OPERAND_UIMM8 :
 319       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM8, (unsigned long *) (& fields->f_uimm8));
 320       break;
 321     case M32R_OPERAND_ULO16 :
 322       errmsg = parse_ulo16 (cd, strp, M32R_OPERAND_ULO16, (unsigned long *) (& fields->f_uimm16));
 323       break;
 324
 325     default :
 326       /* xgettext:c-format */
 327       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 328       abort ();
 329   }
 330
 331   return errmsg;
 332 }
 333
 334 cgen_parse_fn * const m32r_cgen_parse_handlers[] =
 335 {
 336   parse_insn_normal,
 337 };
 338
 339 void
 340 m32r_cgen_init_asm (CGEN_CPU_DESC cd)
 341 {
 342   m32r_cgen_init_opcode_table (cd);
 343   m32r_cgen_init_ibld_table (cd);
 344   cd->parse_handlers = & m32r_cgen_parse_handlers[0];
 345   cd->parse_operand = m32r_cgen_parse_operand;
 346 #ifdef CGEN_ASM_INIT_HOOK
 347 CGEN_ASM_INIT_HOOK
 348 #endif
 349 }
 350
 351 \f
 352
 353 /* Regex construction routine.
 354
 355    This translates an opcode syntax string into a regex string,
 356    by replacing any non-character syntax element (such as an
 357    opcode) with the pattern '.*'
 358
 359    It then compiles the regex and stores it in the opcode, for
 360    later use by m32r_cgen_assemble_insn
 361
 362    Returns NULL for success, an error message for failure.  */
 363
 364 char *
 365 m32r_cgen_build_insn_regex (CGEN_INSN *insn)
 366 {
 367   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 368   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 369   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 370   char *rx = rxbuf;
 371   const CGEN_SYNTAX_CHAR_TYPE *syn;
 372   int reg_err;
 373
 374   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 375
 376   /* Mnemonics come first in the syntax string.  */
 377   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 378     return _("missing mnemonic in syntax string");
 379   ++syn;
 380
 381   /* Generate a case sensitive regular expression that emulates case
 382      insensitive matching in the "C" locale.  We cannot generate a case
 383      insensitive regular expression because in Turkish locales, 'i' and 'I'
 384      are not equal modulo case conversion.  */
 385
 386   /* Copy the literal mnemonic out of the insn.  */
 387   for (; *mnem; mnem++)
 388     {
 389       char c = *mnem;
 390
 391       if (ISALPHA (c))
 392         {
 393           *rx++ = '[';
 394           *rx++ = TOLOWER (c);
 395           *rx++ = TOUPPER (c);
 396           *rx++ = ']';
 397         }
 398       else
 399         *rx++ = c;
 400     }
 401
 402   /* Copy any remaining literals from the syntax string into the rx.  */
 403   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 404     {
 405       if (CGEN_SYNTAX_CHAR_P (* syn))
 406         {
 407           char c = CGEN_SYNTAX_CHAR (* syn);
 408
 409           switch (c)
 410             {
 411               /* Escape any regex metacharacters in the syntax.  */
 412             case '.': case '[': case '\\':
 413             case '*': case '^': case '$':
 414
 415 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 416             case '?': case '{': case '}':
 417             case '(': case ')': case '*':
 418             case '|': case '+': case ']':
 419 #endif
 420               *rx++ = '\\';
 421               *rx++ = c;
 422               break;
 423
 424             default:
 425               if (ISALPHA (c))
 426                 {
 427                   *rx++ = '[';
 428                   *rx++ = TOLOWER (c);
 429                   *rx++ = TOUPPER (c);
 430                   *rx++ = ']';
 431                 }
 432               else
 433                 *rx++ = c;
 434               break;
 435             }
 436         }
 437       else
 438         {
 439           /* Replace non-syntax fields with globs.  */
 440           *rx++ = '.';
 441           *rx++ = '*';
 442         }
 443     }
 444
 445   /* Trailing whitespace ok.  */
 446   * rx++ = '[';
 447   * rx++ = ' ';
 448   * rx++ = '\t';
 449   * rx++ = ']';
 450   * rx++ = '*';
 451
 452   /* But anchor it after that.  */
 453   * rx++ = '$';
 454   * rx = '\0';
 455
 456   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 457   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 458
 459   if (reg_err == 0)
 460     return NULL;
 461   else
 462     {
 463       static char msg[80];
 464
 465       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 466       regfree ((regex_t *) CGEN_INSN_RX (insn));
 467       free (CGEN_INSN_RX (insn));
 468       (CGEN_INSN_RX (insn)) = NULL;
 469       return msg;
 470     }
 471 }
 472
 473 \f
 474 /* Default insn parser.
 475
 476    The syntax string is scanned and operands are parsed and stored in FIELDS.
 477    Relocs are queued as we go via other callbacks.
 478
 479    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 480    parse the instruction, we return 0 and the caller will start over from
 481    the beginning.  Backtracking will be necessary in parsing subexpressions,
 482    but that can be handled there.  Not handling backtracking here may get
 483    expensive in the case of the m68k.  Deal with later.
 484
 485    Returns NULL for success, an error message for failure.  */
 486
 487 static const char *
 488 parse_insn_normal (CGEN_CPU_DESC cd,
 489                    const CGEN_INSN *insn,
 490                    const char **strp,
 491                    CGEN_FIELDS *fields)
 492 {
 493   /* ??? Runtime added insns not handled yet.  */
 494   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 495   const char *str = *strp;
 496   const char *errmsg;
 497   const char *p;
 498   const CGEN_SYNTAX_CHAR_TYPE * syn;
 499 #ifdef CGEN_MNEMONIC_OPERANDS
 500   /* FIXME: wip */
 501   int past_opcode_p;
 502 #endif
 503
 504   /* For now we assume the mnemonic is first (there are no leading operands).
 505      We can parse it without needing to set up operand parsing.
 506      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 507      not be called from GAS.  */
 508   p = CGEN_INSN_MNEMONIC (insn);
 509   while (*p && TOLOWER (*p) == TOLOWER (*str))
 510     ++p, ++str;
 511
 512   if (* p)
 513     return _("unrecognized instruction");
 514
 515 #ifndef CGEN_MNEMONIC_OPERANDS
 516   if (* str && ! ISSPACE (* str))
 517     return _("unrecognized instruction");
 518 #endif
 519
 520   CGEN_INIT_PARSE (cd);
 521   cgen_init_parse_operand (cd);
 522 #ifdef CGEN_MNEMONIC_OPERANDS
 523   past_opcode_p = 0;
 524 #endif
 525
 526   /* We don't check for (*str != '\0') here because we want to parse
 527      any trailing fake arguments in the syntax string.  */
 528   syn = CGEN_SYNTAX_STRING (syntax);
 529
 530   /* Mnemonics come first for now, ensure valid string.  */
 531   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 532     abort ();
 533
 534   ++syn;
 535
 536   while (* syn != 0)
 537     {
 538       /* Non operand chars must match exactly.  */
 539       if (CGEN_SYNTAX_CHAR_P (* syn))
 540         {
 541           /* FIXME: While we allow for non-GAS callers above, we assume the
 542              first char after the mnemonic part is a space.  */
 543           /* FIXME: We also take inappropriate advantage of the fact that
 544              GAS's input scrubber will remove extraneous blanks.  */
 545           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 546             {
 547 #ifdef CGEN_MNEMONIC_OPERANDS
 548               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 549                 past_opcode_p = 1;
 550 #endif
 551               ++ syn;
 552               ++ str;
 553             }
 554           else if (*str)
 555             {
 556               /* Syntax char didn't match.  Can't be this insn.  */
 557               static char msg [80];
 558
 559               /* xgettext:c-format */
 560               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 561                        CGEN_SYNTAX_CHAR(*syn), *str);
 562               return msg;
 563             }
 564           else
 565             {
 566               /* Ran out of input.  */
 567               static char msg [80];
 568
 569               /* xgettext:c-format */
 570               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 571                        CGEN_SYNTAX_CHAR(*syn));
 572               return msg;
 573             }
 574           continue;
 575         }
 576
 577 #ifdef CGEN_MNEMONIC_OPERANDS
 578       (void) past_opcode_p;
 579 #endif
 580       /* We have an operand of some sort.  */
 581       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
 582       if (errmsg)
 583         return errmsg;
 584
 585       /* Done with this operand, continue with next one.  */
 586       ++ syn;
 587     }
 588
 589   /* If we're at the end of the syntax string, we're done.  */
 590   if (* syn == 0)
 591     {
 592       /* FIXME: For the moment we assume a valid `str' can only contain
 593          blanks now.  IE: We needn't try again with a longer version of
 594          the insn and it is assumed that longer versions of insns appear
 595          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 596       while (ISSPACE (* str))
 597         ++ str;
 598
 599       if (* str != '\0')
 600         return _("junk at end of line"); /* FIXME: would like to include `str' */
 601
 602       return NULL;
 603     }
 604
 605   /* We couldn't parse it.  */
 606   return _("unrecognized instruction");
 607 }
 608 \f
 609 /* Main entry point.
 610    This routine is called for each instruction to be assembled.
 611    STR points to the insn to be assembled.
 612    We assume all necessary tables have been initialized.
 613    The assembled instruction, less any fixups, is stored in BUF.
 614    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 615    still needs to be converted to target byte order, otherwise BUF is an array
 616    of bytes in target byte order.
 617    The result is a pointer to the insn's entry in the opcode table,
 618    or NULL if an error occured (an error message will have already been
 619    printed).
 620
 621    Note that when processing (non-alias) macro-insns,
 622    this function recurses.
 623
 624    ??? It's possible to make this cpu-independent.
 625    One would have to deal with a few minor things.
 626    At this point in time doing so would be more of a curiosity than useful
 627    [for example this file isn't _that_ big], but keeping the possibility in
 628    mind helps keep the design clean.  */
 629
 630 const CGEN_INSN *
 631 m32r_cgen_assemble_insn (CGEN_CPU_DESC cd,
 632                            const char *str,
 633                            CGEN_FIELDS *fields,
 634                            CGEN_INSN_BYTES_PTR buf,
 635                            char **errmsg)
 636 {
 637   const char *start;
 638   CGEN_INSN_LIST *ilist;
 639   const char *parse_errmsg = NULL;
 640   const char *insert_errmsg = NULL;
 641   int recognized_mnemonic = 0;
 642
 643   /* Skip leading white space.  */
 644   while (ISSPACE (* str))
 645     ++ str;
 646
 647   /* The instructions are stored in hashed lists.
 648      Get the first in the list.  */
 649   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 650
 651   /* Keep looking until we find a match.  */
 652   start = str;
 653   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 654     {
 655       const CGEN_INSN *insn = ilist->insn;
 656       recognized_mnemonic = 1;
 657
 658 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 659       /* Not usually needed as unsupported opcodes
 660          shouldn't be in the hash lists.  */
 661       /* Is this insn supported by the selected cpu?  */
 662       if (! m32r_cgen_insn_supported (cd, insn))
 663         continue;
 664 #endif
 665       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 666          chosen immediately.  Instead, it is used during assembler/linker
 667          relaxation if possible.  */
 668       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 669         continue;
 670
 671       str = start;
 672
 673       /* Skip this insn if str doesn't look right lexically.  */
 674       if (CGEN_INSN_RX (insn) != NULL &&
 675           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 676         continue;
 677
 678       /* Allow parse/insert handlers to obtain length of insn.  */
 679       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 680
 681       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 682       if (parse_errmsg != NULL)
 683         continue;
 684
 685       /* ??? 0 is passed for `pc'.  */
 686       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 687                                                  (bfd_vma) 0);
 688       if (insert_errmsg != NULL)
 689         continue;
 690
 691       /* It is up to the caller to actually output the insn and any
 692          queued relocs.  */
 693       return insn;
 694     }
 695
 696   {
 697     static char errbuf[150];
 698     const char *tmp_errmsg;
 699 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 700 #define be_verbose 1
 701 #else
 702 #define be_verbose 0
 703 #endif
 704
 705     if (be_verbose)
 706       {
 707         /* If requesting verbose error messages, use insert_errmsg.
 708            Failing that, use parse_errmsg.  */
 709         tmp_errmsg = (insert_errmsg ? insert_errmsg :
 710                       parse_errmsg ? parse_errmsg :
 711                       recognized_mnemonic ?
 712                       _("unrecognized form of instruction") :
 713                       _("unrecognized instruction"));
 714
 715         if (strlen (start) > 50)
 716           /* xgettext:c-format */
 717           sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 718         else
 719           /* xgettext:c-format */
 720           sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 721       }
 722     else
 723       {
 724         if (strlen (start) > 50)
 725           /* xgettext:c-format */
 726           sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 727         else
 728           /* xgettext:c-format */
 729           sprintf (errbuf, _("bad instruction `%.50s'"), start);
 730       }
 731
 732     *errmsg = errbuf;
 733     return NULL;
 734   }
 735 }